math/bits: add examples for leading zero methods

Change-Id: Ib491d144387a7675af370f7b925fe6e62440d153
Reviewed-on: https://go-review.googlesource.com/48966
Run-TryBot: Kevin Burke <kev@inburke.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Kevin Burke <kev@inburke.com>

diff --git a/src/math/bits/example_test.go b/src/math/bits/example_test.go
new file mode 100644 (file)
index 0000000..5d30f4b
--- /dev/null
+++ b/src/math/bits/example_test.go
@@ -0,0 +1,38 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bits_test
+
+import (
+       "fmt"
+       "math/bits"
+)
+
+func ExampleLeadingZeros16() {
+       fmt.Println(bits.LeadingZeros16(0))
+       fmt.Println(bits.LeadingZeros16(1))
+       fmt.Println(bits.LeadingZeros16(256))
+       fmt.Println(bits.LeadingZeros16(65535))
+       // Output:
+       // 16
+       // 15
+       // 7
+       // 0
+}
+
+func ExampleLeadingZeros32() {
+       fmt.Println(bits.LeadingZeros32(0))
+       fmt.Println(bits.LeadingZeros32(1))
+       // Output:
+       // 32
+       // 31
+}
+
+func ExampleLeadingZeros64() {
+       fmt.Println(bits.LeadingZeros64(0))
+       fmt.Println(bits.LeadingZeros64(1))
+       // Output:
+       // 64
+       // 63
+}